Suspension for oral administration comprising amorphous tolvaptan

Abstract

This invention provides a suspension for oral administration comprising particles containing amorphous tolvaptan that can inhibit or delay crystallization of amorphous tolvaptan over time in the suspension, and stably maintain high solubility of tolvaptan and excellent absorbability of tolvaptan from the gastrointestinal tract; and a solid formulation for oral administration that can be suspended to prepare the suspension for oral administration at the time of use. This invention relates to a suspension for oral administration, in particular, a syrup, comprising (a) particles containing amorphous tolvaptan, (b) hydroxypropyl methylcellulose (HPMC), and (c) a solvent, wherein the amount of the HPMC (b) is 0.1 to 25% by weight based on the total weight of the suspension for oral administration.

1 . A suspension for oral administration, comprising:
 (a) particles containing amorphous tolvaptan;   (b) hydroxypropyl methylcellulose (HPMC); and   (c) a solvent.   
     
     
         2 . The suspension for oral administration according to  claim 1 , wherein the amount of the HPMC (b) is 0.1 to 25% by weight based on the total weight of the suspension for oral administration. 
     
     
         3 . The suspension for oral administration according to  claim 1 , wherein the HPMC (b) has a viscosity of 1 to 4000 mPa·s in a 2% aqueous solution at 20° C. 
     
     
         4 . The suspension for oral administration according to  claim 1 , wherein the amount of the particles containing amorphous tolvaptan (a) is 0.01 to 5% by weight based on the total weight of the suspension for oral administration. 
     
     
         5 . The suspension for oral administration according to  claim 1 , wherein the particles containing amorphous tolvaptan (a) contain amorphous tolvaptan and optionally a polymer. 
     
     
         6 . The suspension for oral administration according to  claim 5 , wherein the polymer is at least one member selected from the group consisting of hydroxypropyl cellulose (HPC) and hydroxypropyl methylcellulose (HPMC). 
     
     
         7 . The suspension for oral administration according to  claim 5 , wherein the weight ratio of the tolvaptan to the polymer in the particles containing amorphous tolvaptan (a) is 1:0 to 1:4. 
     
     
         8 . The suspension for oral administration according to  claim 1 , wherein the solvent (c) is water. 
     
     
         9 . The suspension for oral administration according to  claim 1 , further comprising (d) a suspending agent and/or (e) a sweetener. 
     
     
         10 . The suspension for oral administration according to  claim 9 , wherein the suspending agent (d) is at least one member selected from the group consisting of xanthan gum, gellan gum, carrageenan, carboxyvinyl polymers, and sodium carboxymethyl cellulose. 
     
     
         11 . The suspension for oral administration according to  claim 9 , wherein the sweetener (e) is at least one member selected from the group consisting of mannitol, sorbitol, xylitol, maltitol, erythritol, sucrose, sucralose, aspartame, acesulfame potassium, saccharin, thaumatin, stevia extracts, trehalose, lactose, maltose, glucose, and glycerin. 
     
     
         12 . The suspension for oral administration according to  claim 1 , further comprising at least one member selected from the group consisting of pH-adjusting agents, preservatives, stabilizers, and flavoring agents. 
     
     
         13 . The suspension for oral administration according to  claim 1 , which is in the form of a syrup. 
     
     
         14 . A method for producing a suspension for oral administration, the method comprising uniformly dispersing particles containing amorphous tolvaptan in an aqueous suspension containing HPMC or an aqueous solution containing HPMC. 
     
     
         15 . The method according to  claim 14 , wherein the amount of the HPMC is 0.1 to 25% by weight based on the total weight of the suspension for oral administration. 
     
     
         16 . The suspension for oral administration according to  claim 1 , for use as a drug for preventing, reducing, or treating hyponatremia, polycystic kidney disease, body fluid retention in heart failure, or body fluid retention in liver cirrhosis. 
     
     
         17 . Use of the suspension for oral administration according to  claim 1  for the production of a drug for preventing, reducing, or treating hyponatremia, polycystic kidney disease, body fluid retention in heart failure, or body fluid retention in liver cirrhosis. 
     
     
         18 . Use of a suspension comprising (a) particles containing amorphous tolvaptan, (b) hydroxypropyl methylcellulose (HPMC), and (c) a solvent for the production of a drug for preventing, reducing, or treating hyponatremia, polycystic kidney disease, body fluid retention in heart failure, or body fluid retention in liver cirrhosis. 
     
     
         19 . A method for preventing, reducing, or treating hyponatremia, polycystic kidney disease, body fluid retention in heart failure, or body fluid retention in liver cirrhosis, the method comprising administering the suspension for oral administration according to  claim 1  to a patient in recognized need of prevention, reduction, or treatment of hyponatremia, polycystic kidney disease, body fluid retention in heart failure, or body fluid retention in liver cirrhosis.